Index: clang-tools-extra/trunk/clang-tidy/google/IntegerTypesCheck.cpp
===================================================================
--- clang-tools-extra/trunk/clang-tidy/google/IntegerTypesCheck.cpp
+++ clang-tools-extra/trunk/clang-tidy/google/IntegerTypesCheck.cpp
@@ -11,6 +11,7 @@
 #include "clang/AST/ASTContext.h"
 #include "clang/ASTMatchers/ASTMatchFinder.h"
 #include "clang/ASTMatchers/ASTMatchers.h"
+#include "clang/Basic/AttrKinds.h"
 #include "clang/Basic/CharInfo.h"
 #include "clang/Basic/IdentifierTable.h"
 #include "clang/Basic/TargetInfo.h"
@@ -56,7 +57,16 @@
   // Find all TypeLocs. The relevant Style Guide rule only applies to C++.
   if (!getLangOpts().CPlusPlus)
     return;
-  Finder->addMatcher(typeLoc(loc(isInteger())).bind("tl"), this);
+  // Match any integer types, unless they are passed to a printf-based API:
+  //
+  // http://google.github.io/styleguide/cppguide.html#64-bit_Portability
+  // "Where possible, avoid passing arguments of types specified by
+  // bitwidth typedefs to printf-based APIs."
+  Finder->addMatcher(typeLoc(loc(isInteger()),
+                             unless(hasAncestor(callExpr(
+                                 callee(functionDecl(hasAttr(attr::Format)))))))
+                         .bind("tl"),
+                     this);
   IdentTable = llvm::make_unique<IdentifierTable>(getLangOpts());
 }
 
Index: clang-tools-extra/trunk/test/clang-tidy/google-runtime-int.cpp
===================================================================
--- clang-tools-extra/trunk/test/clang-tidy/google-runtime-int.cpp
+++ clang-tools-extra/trunk/test/clang-tidy/google-runtime-int.cpp
@@ -72,3 +72,20 @@
   B a, b;
   a = b;
 }
+
+__attribute__((__format__ (__printf__, 1, 2)))
+void myprintf(const char* s, ...);
+
+void doprint_no_warning() {
+  uint64 foo = 23;
+  myprintf("foo %lu %lu", (unsigned long)42, (unsigned long)foo);
+}
+
+void myprintf_no_attribute(const char* s, ...);
+
+void doprint_warning() {
+  uint64 foo = 23;
+  myprintf_no_attribute("foo %lu %lu", (unsigned long)42, (unsigned long)foo);
+// CHECK-MESSAGES: [[@LINE-1]]:41: warning: consider replacing 'unsigned long'
+// CHECK-MESSAGES: [[@LINE-2]]:60: warning: consider replacing 'unsigned long'
+}